<template>
    <div class="cate">
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 添加分类 -->
            <el-row>
                <el-col>
                    <el-button
                        type="primary"
                        @click="showAddCateDialog"
                    >添加分类</el-button>
                </el-col>
            </el-row>
            <!-- tree-table表格 -->
            <tree-table
                :data="cateList"
                :columns="columns"
                show-index
                border
                stripe
                :expand-type="false"
                :selection-type="false"
            >
                <!-- 是否有效 -->
                <template
                    slot="isOk"
                    slot-scope="scope"
                >
                    <i
                        class="el-icon-error"
                        style="color:red;"
                        v-if="scope.row.cat_deleted"
                    ></i>
                    <i
                        class="el-icon-success"
                        style="color:lightgreen;"
                        v-else
                    ></i>
                </template>
                <!-- 排序 -->
                <template
                    slot="order"
                    slot-scope="scope"
                >
                    <el-tag
                        size="mini"
                        v-if="scope.row.cat_level===0"
                    >一级</el-tag>
                    <el-tag
                        size="mini"
                        type="success"
                        v-else-if="scope.row.cat_level===1"
                    >二级</el-tag>
                    <el-tag
                        size="mini"
                        type="warning"
                        v-else
                    >三级</el-tag>
                </template>
                <template
                    slot="operate"
                    slot-scope="scope"
                >
                    <el-button
                        type="primary"
                        icon="el-icon-edit"
                        size="mini"
                        @click="showEditCateDialog(scope.row.cat_id)"
                    >编辑</el-button>
                    <el-button
                        type="danger"
                        icon="el-icon-delete"
                        size="mini"
                        @click="removeCateById(scope.row.cat_id)"
                    >删除</el-button>
                </template>
            </tree-table>
            <!-- 分页 -->
            <el-pagination
                @size-change="handleSizeChange"
                @current-change="handleCurrentChange"
                :current-page="queryInfo.pagenum"
                :page-sizes="[1, 2, 5,10]"
                :page-size="queryInfo.pagesize"
                layout="total, sizes, prev, pager, next, jumper"
                :total="total"
                background
            >
            </el-pagination>
        </el-card>
        <!-- 添加分类的对话框 -->
        <el-dialog
            title="添加分类"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed"
        >
            <el-form
                :model="addCateForm"
                :rules="addCateFormRules"
                ref="addCateFormRef"
                label-width="100px"
            >
                <el-form-item
                    label="分类名称"
                    prop="cat_name"
                >
                    <el-input v-model="addCateForm.cat_name" class="w100"></el-input>
                </el-form-item>
                <el-form-item label="父级分类">
                    <el-cascader
                        :options="parentCateList"
                        :props="cascaderProps"
                        v-model="selectedKeys"
                        @change="handleChange"
                        clearable
                        class="w100"
                    ></el-cascader>
                </el-form-item>

            </el-form>
            <span
                slot="footer"
                class="dialog-footer"
            >
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button
                    type="primary"
                    @click="addCate"
                >确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改分类的对话框 -->
        <el-dialog
            title="修改分类"
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClosed"
        >
            <el-form
                :model="editCateForm"
                :rules="editCateFormRules"
                ref="editCateFormRef"
                label-width="100px"
            >
                <el-form-item
                    label="分类名称"
                    prop="cat_name"
                >
                    <el-input v-model="editCateForm.cat_name" class="w100"></el-input>
                </el-form-item>
            </el-form>
            <span
                slot="footer"
                class="dialog-footer"
            >
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button
                    type="primary"
                    @click="editCate"
                >确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
 
<script>
export default {
    data() {
        return {
            // 获取分类列表的参数
            queryInfo: {
                type: 3, //获取3级和3级以上
                pagenum: 1, //页码
                pagesize: 5 //页大小
            },
            cateList: [],
            total: 0,
            columns: [
                {
                    label: '分类名称',
                    prop: 'cat_name'
                },
                {
                    label: '是否有效',
                    // 将当前列定义为自定义模板
                    type: 'template',
                    template: 'isOk'
                },
                {
                    label: '排序',
                    // 将当前列定义为自定义模板
                    type: 'template',
                    template: 'order'
                },
                {
                    label: '操作',
                    // 将当前列定义为自定义模板
                    type: 'template',
                    template: 'operate'
                }
            ],
            // 添加分类的对话框的显示和隐藏
            addDialogVisible: false,
            // 添加分类的表单数据对象
            addCateForm: {
                cat_name: '',
                cat_pid: 0, //父级分类的id
                cat_level: 0
            },
            addCateFormRules: {
                cat_name: [
                    { required: true, message: '请输入分类名称', trigger: 'blur' },
                ]
            },
            // 父级分类的列表
            parentCateList: [],
            // 指定级联选择器的配置对象
            cascaderProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                // multiple: true,
                checkStrictly: true
            },
            // 选中的父级分类的id数组
            selectedKeys: [],
            // 修改分类对话框的显示和隐藏
            editDialogVisible: false,
            // 修改分类的表单对象
            editCateForm: {},
            // 修改分类的校验规则
            editCateFormRules: {
                cat_name: [
                    { required: true, message: '请输入分类名称', trigger: 'blur' },
                ]
            },

        }
    },
    created() {
        this.getCateList();
    },
    methods: {
        // 获取商品分类列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories', {
                params: this.queryInfo
            });
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败');
            }
            this.cateList = res.data.result;
            this.total = res.data.total;
        },
        // 处理分页大小
        handleSizeChange(pagesize) {
            this.queryInfo.pagesize = pagesize;
            // 刷新商品分类列表
            this.getCateList();
        },
        handleCurrentChange(pagenum) {
            this.queryInfo.pagenum = pagenum;
            this.getCateList();
        },
        // 点击按钮，展示添加分类的对话框
        showAddCateDialog() {
            this.addDialogVisible = true;
            this.getParentCateList()
        },
        // 获取父级分类的数据列表
        async getParentCateList() {
            const { data: res } = await this.$http.get('categories', {
                params: { type: 2 }
            });
            if (res.meta.status !== 200) {
                return this.$message.error('获取父级分类数据失败');
            }
            this.parentCateList = res.data;
        },
        // 选择项发生变化触发这个函数
        handleChange() {
            // 如果selectedKeys数组的length大于0，说明选中父级分类 
            // 反之，说明没有选中任何父级
            if (this.selectedKeys.length > 0) {
                // 父级分类的id
                this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
                // 为当前分类的等级赋值
                this.addCateForm.cat_level = this.selectedKeys.length
                return
            } else {
                // 父级分类的id
                this.addCateForm.cat_pid = 0
                // 为当前分类的等级赋值
                this.addCateForm.cat_level = 0
            }

        },
        addCate() {
            this.$refs.addCateFormRef.validate(async valid => {
                if (!valid) {
                    return
                }
                const { data: res } = await this.$http.post('categories', this.addCateForm)
                if (res.meta.status !== 201) {
                    return this.$message.error('添加分类失败');
                }
                this.$message.success('添加分类成功');
                this.getCateList();
                this.addDialogVisible = false;
            })

        },
        // 监听添加分类的对话框
        addDialogClosed() {
            this.$refs.addCateFormRef.resetFields();
            // 父级分类的id
            this.addCateForm.cat_pid = 0;
            // 为当前分类的等级赋值
            this.addCateForm.cat_level = 0;
            this.selectedKeys = [];
        },
        // 展示修改分类的对话框
        async showEditCateDialog(id) {
            const { data: res } = await this.$http.get(`categories/${id}`);
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败');
            }
            this.editCateForm = res.data;
            this.editDialogVisible = true
        },
        editCate() {
            // 判断表单校验是否成功
            this.$refs.editCateFormRef.validate(async valid => {
                if (!valid) {
                    return;
                }
                const { data: res } = await this.$http.put(`categories/${this.editCateForm.cat_id}`, {
                    cat_name: this.editCateForm.cat_name,
                }) //直接返回执行的结果
                if (res.meta.status !== 200) {
                    return this.$message.error('修改分类失败');
                }
                // 关闭对话框
                this.editDialogVisible = false;
                // 刷新分类列表
                this.getCateList();
                this.$message.success('修改分类成功');
            })
        },
        // 监听修改分类的对话框
        editDialogClosed() {
            this.$refs.editCateFormRef.resetFields();
        },
        // 删除分类
        removeCateById(id) {
            this.$confirm('确定要删除该分类吗?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(async () => {
                const { data: res } = await this.$http.delete(`categories/${id}`);
                if (res.meta.status !== 200) {
                    return this.$message.error('删除分类失败');
                }
                this.getCateList();
                this.$message.success('删除分类成功');
            }).catch(() => {
                this.$message.info('已取消删除');
            });
        },
    },
}
</script>
 
<style lang="less" scoped>
.cate {
    width: 100%;
}
.el-button {
    margin-bottom: 15px;
}
</style>